`-safe-string` is the future. Any compiler can not guarantee its correctness if you write crazy code , `Obj.magic` here. I am not interested in core personally,

`-safe-string` is the future. Any compiler can not guarantee its correctness if you write crazy code , `Obj.magic` here. I am not interested in core personally, but I don't see any reason why it will not work if it is vanilla OCaml